Coupling device for impact-tips



July 16, 1935.. T. J. FEGLEY ET AL 2@@8,352

COUPLING DEVICE FOR IMPACT TIPS Filed July 1, 1953 f 7i if III Patented July 16, 1935 PATENT OFFICE COUPLING DEVICE FOR IMPACT-TIPS Thomas J. Fegley, Jenkintown, and George 0. Leopold, Philadelphia, Pa., assignors to North Bros Mfg 00., Philadelphia, Pa., a corporation of Pennsylvania Application July 1, 1933, Serial No. 678,680

3 Claims.

This invention relates to a device for securing impact-tips to the Wooden handles of screw drivers, chisels and the like for the purpose of enabling the handle to withstand the impact of a hammer or other tool to which it may be subjected.

Specifically, a principal object of the invention is to provide means for permanently and securely attaching to the wooden handles of screw drivers, chisels and like tools a tip or end portion of vulcanized fibre.

In the attached drawing:

Figure 1 is a fragmentary sectional view through the end of a handle made in accordance with our invention;

Fig. 2 is a view in perspective of the outer terminal end of the handle prior to attaching the.

Fig. 3 is a view in perspective of the tip;

Fig. 4 shows in perspective the elements of the device by means of which the tip is secured to the handle, and

Fig. 5 is a sectional view illustrating the manner in which the securing means is applied to the tip.

With reference to Fig. l of the drawing, the reference numeral I designates the free end of the wooden handle of a screw driver or similar tool, and 2 is a tip of vulcanized fibre which is securely held in position at the end of the handle I by means of a coupling device constituting the subject of the present invention. This coupling device as shown in Figs. 1, 4 and 5 consists of three parts, namely, a cylindrical main member 3 and two frusto-conical wedge elements 4 and 5.

As shown in Figs. 4 and 5, the member 3 is recessed at both ends, these recesses being designated in Fig. 5 by the reference numerals 6 and 1 respectively. The outer diameter of the member 3 and the major or base diameters of the conical elements 4 and 5 are substantially the same; and. the end edges of the cylindrical member 3 are beveled to provide relatively sharp terminal edges for a purpose hereinafter set forth.

In using this device, the handle I is provided in its end with a cylindrical recess 8 of a diameter to neatly receive the conical element 5 and the member 3 of the coupling. The tip 2 is provided with a similar recess 9 in its under face which receives the element 4 and the end of the member 3. Preferably, the coupling member is applied first to the tip 3, and to this end the element 4 is first inserted into the bottom of the recess 9 and the end of the member 3 inserted over the element 4 after the manner shown in Fig. 5.

Pressure is now applied to force the member 3 inwardly, with the result that the walls of the recess 6 are spread transversely by the inclined walls of the wedge element 4. This spreading action continues until the top of the wedge element 4 engages the bottom of the recess 6, at which time the parts have assumed the positions shown in Fig. 1. The sharp edges of the walls of the recess 6 aid in this spreading action by permitting the walls more readily to enter the body of the fibre.

The element 5 is now inserted in the bottom of the recess 8 of the handle I and subsequently the projecting end of the member 3. Pressure is now applied tending to force the member 3 into the recess, with the result that the walls of the recess I of the member 3 are spread transversely and are caused to forcibly enter the wood, after the manner previously described in connection with the tip 2, until the parts assume the positions shown in Fig. l, The tip 2 and handle I are thus securely coupled together through the medium of the elements 3, 4 and 5. I

This coupling is such that it is not afiected by impact upon the tip 2. It is completely embedded and concealed within the handle and tip and is, therefore, not subjected to direct impact. Its construction and mode of assembly is such, in fact, that impact upon the tip actually tends to make the connection more secure. The vulcanized fibre has an extremely high density and toughness and resistance to fracture and will withstand impact over long periods without material deterioration.

There may be modification in the detailed form of the coupling without departure from the invention.

We claim:

1. In combination with a non-metallic tool handle, a non-metallic impact-tip for said handle, said handle and tip having aligned recesses in their adjoining faces, a Wedge element in the bottom of each of said recesses, and a metallic coupling element normally fitting said recesses and having end portions with sharpened extremities, said end portions engaging the sides of said wedge elements so that by forcing the tip and handle together the said end portions are made to penetrate the non-metallic walls of said recesses in directions substantially parallel to the inclined sides of the wedge elements to thereby securely and permanently unite the tip with the handle.

2. In combination with a non-metallic tool handle, a non-metallic impact-tip for said handle, said handle and tip having aligned cylindrical recesses in their adjoining faces, a frustoconical wedge element in the bottom of each of said recesses, and a cylindrical metallic coupling element normally fitting said recesses and having recesses in opposite ends for reception of said wedges, the end edges of said coupling element being sharpened and being adapted when the tip and handle are" forced together to penetrate the non-metallic Walls of said recesses in directions substantially parallel to the inclined sides of the Wedge elements to thereby securely and permanently unite the tip withthe handle.

3. In combination, a non-metallic element having a recess, a wedge element in the bottom of said recess, a metallic element fitted to said recess and. having an end portion engaging the inclined side of said Wedge, the extremity of said end portion being sharpened and being forcibly driven into the non-metallic wall of the recess in a direction substantially parallel to the inclined side of the wedgeelement' to thereby securely and permanently unite the metallic element with the said non-metallic element.

THOMAS J. FEGLEY. GEORGE O. LEOPOLD. 

